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Baumhauerite

• 
  Lengenbach Quarry, Im Feld (Imfeld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland
  © Peter Haas

• Formula:
  Pb₃As₄S₉

• System: Triclinic

• Name:
  After H.A. Baumhauer (1848-1926), Professor of Mineralogy, University of Fribourg, Switzerland.

• IMA Status: Valid (Grandfathered)

• Type Locality:
  Lengenbach Quarry, Im Feld (Imfeld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland

• Dana 8th: 3.6.13.1
  
  3 : SULFOSALTS
  6 : 2 < ø < 2.49

• Hardness (Mohs): 3

• Density: 5.02 g/cm³ (calculated)

• Lustre: Metallic

• Diapheny: Opaque

• Colour: Lead-grey, steel-grey; iridescent at times

• Streak: Chocolate-brown